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Inst Tools > Blog > Control Systems > Difference Between SCADA and HMI

Difference Between SCADA and HMI

Difference Between SCADA and HMI : SCADA stands for Supervisory Control and Data Acquisition and HMI stands for Human Machine Interface. SCADA versus HMI.

Last updated: November 3, 2023 3:08 pm
Editorial Staff
Control Systems PLC Tutorials
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Sometimes instrumentation engineers confuse about the difference between SCADA and HMI systems. Read the following basic outline to understand about the SCADA versus HMI.

Contents
Difference Between SCADA and HMISCADA – Olden Days versus Modern Days

Difference Between SCADA and HMI

Difference Between SCADA and HMI

Supervisory Control and Data Acquisition (SCADA) and Human Machine Interface (HMI) are closely related, and often referred to in the same context since they are both parts of a larger industrial control system, but they each offer different functionality and opportunities.

While HMIs are focused on visually conveying information to help the user supervise an industrial process, SCADA systems have a greater capacity for data collection and control system operation.

SCADA Articles

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The below figure shows an example of the Human Machine Interface (HMI).

Human Machine Interface

Unlike SCADA systems, HMIs do not collect and record information or connect to databases. Rather, HMI provides an effective communication tool that functions as part of, or alongside, a SCADA system.

SCADA – Olden Days versus Modern Days

In the olden days, we call the complete control system as SCADA. Meaning that it includes controllers, I/O modules, workstations, network communication, etc.

But with the modernization of industrial automation, DCS and PLC systems are evolved and SCADA becomes part of these systems and now we use them for operator interface graphics. So, Do not confuse the definitions of SCADA between these decades.

The below figure shows an example of SCADA graphics.

Supervisory Control and Data Acquisition (SCADA)

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  • SCADA & Telemetry Systems
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